I bought a speedo that looks identical to this one, and it worked well for a few weeks, but then became less and less accurate for some reason...stripping of internal gears maybe?? It couldn't handle running at higher speeds for long distances.

If you cruise around at 20mph or less, I think it will work fine for you.

__________________
Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction.
- Albert Einstein